How to send Asynchronous email from .net :

In this article I will show you how to send mail asynchronously, which can be used
in sending bulk mail. This feature is very useful when you send lots of bulk mails
like news letter. You don’t have to wait for response from mail server and you can
do other task or with the help of this feature you don’t need to wait for the email
to be sent before performing other tasks in the page. But instead these tasks can
be performed while the mail is being sent asynchronously.

System.Net.Mail has also added asynchronous support for sending email. To send
asynchronously, you need need to